单项选择题
A.ΔrHθm1+ΔrHθm2 B.ΔrHθm1-ΔrHθm2 C.2ΔrHθm2-ΔrHθm1 D.ΔrHθm2-ΔrHθm1
A.+0.162V B.-0.162V C.-0.360V D.+0.360V
A.1/32 B.1/16 C.1/8 D.1/4